Right... not an unmodified 1920x1080 picture anymore. If you find the specs on your TV and it will allow a minor variation in frequencies, you could get your overscan taken care of with some modeline tweaking. The best way to get rid of an overscan is to go to the service mode of the TV and adjust it so there *isn't* any. I find it strange that during the shift to HDTV they didnt' get rid of the overscanning nonsense.Doing this probably makes your nice 1920x1080 resolution into a bastardized 18XXx10XX size for video playback. Thus it's distorting the picture by forcing a rescale.
I'm running a 1760x960 mode inside 1080i timings to fit my screen just right, and despite the forced rescale, its still gorgeous.
To summarize:
- Adjusting H/V on TV through service manual is the best.
- Adjusting modeline to underscan horizontally is trivial and almost always possible.
- Adjusting modeline to underscan vertically is less trivial. It may not be possible while still maintaining the correct number of scanlines, resolution, and H scanning frequencies. If there's a bit of give the TV's frequency ranges (not necessarily what it *can* do, but rather what it's *rated* to do), you might be able to do it.
- Underscanning by other methods is a digital scaling operation. NVidia's tvout adjustment, Jarod's 1760x960 resolution, etc... they're all having to digitally scale an MxN image into PxQ pixels. That can introduce softness, artifacts, etc to the picture. (Think laptop not running at native resolution vs. one that is).
-Cory
************************************************************************* * Cory Papenfuss * * Electrical Engineering candidate Ph.D. graduate student * * Virginia Polytechnic Institute and State University * *************************************************************************
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